diff --git a/nixos/modules/microvm-extras-host.nix b/nixos/modules/microvm-extras-host.nix
index e2a226b..a9274a2 100644
--- a/nixos/modules/microvm-extras-host.nix
+++ b/nixos/modules/microvm-extras-host.nix
@@ -91,14 +91,17 @@ in
     services = {
       tcpUdp = mkOption {
         type = with types; types.attrsOf (submodule tcpUdpServiceOptions);
+        default = {};
       };
 
       icmp = mkOption {
         type = with types; types.attrsOf (submodule icmpServiceOptions);
+        default = {};
       };
 
       http = mkOption {
         type = with types; types.attrsOf (submodule httpServiceOptions);
+        default = {};
       };
     };